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Shareholders' Equity (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 05, 2021
Dec. 22, 2020
Dec. 31, 2017
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]                
Common shares, shares authorized (in shares) 500,000,000       500,000,000 500,000,000   500,000,000
Common shares, par value (in dollars per share) $ 0.01       $ 0.01 $ 0.01   $ 0.01
Common shares, shares outstanding (in shares) 48,756,555       48,756,555 48,756,555   46,973,473
Proceeds from issuance of common shares           $ 24,583,000 $ 128,000  
Preferred shares, shares authorized (in shares) 100,000,000       100,000,000 100,000,000   100,000,000
Preferred shares, par value (in dollars per share) $ 0.01       $ 0.01 $ 0.01   $ 0.01
Preferred shares, shares issued (in shares) 4,800,000       4,800,000 4,800,000   0
Proceeds from issuance of preferred shares           $ 120,000,000 $ 0  
Preferred shares, shares outstanding (in shares) 4,800,000       4,800,000 4,800,000   0
Vested operating partnership units held by current and former employees (in shares) 976,102,000       976,102,000 976,102,000    
ATM Plan                
Class of Stock [Line Items]                
Stock purchase plan, authorized amount       $ 100,000,000        
Registration statement filed, amount   $ 100,000,000            
Shares issued (in shares)         237,114      
Average share price (in dollars per share) $ 13.80       $ 13.80 $ 13.80    
Proceeds from issuance of common shares         $ 3,300,000      
Stock purchase plan, remaining authorized repurchase amount $ 77,500,000       $ 77,500,000 $ 77,500,000    
DRSP Plan                
Class of Stock [Line Items]                
Stock purchase plan, authorized amount       $ 50,000,000        
Registration statement filed, amount     $ 50,000,000          
Shares issued (in shares)         1,240      
Proceeds from issuance of common shares         $ 16,000      
Stock purchase plan, remaining authorized repurchase amount $ 48,000,000.0       $ 48,000,000.0 $ 48,000,000.0    
Stock purchase plan, average price per share (in dollars per share)         $ 13.26      
Series A Preferred Shares                
Class of Stock [Line Items]                
Preferred shares, par value (in dollars per share) $ 0.01       $ 0.01 $ 0.01    
Preferred shares, shares issued (in shares) 4,800,000       4,800,000 4,800,000    
Preferred stock distribution rate 6.625%              
Proceeds from issuance of preferred shares $ 116,200,000              
Liquidation preference per share (in dollars per share) $ 25.00       $ 25.00 $ 25.00    
Liquidation preference per share per annum (in dollars per share) $ 1.65625       $ 1.65625 $ 1.65625    
Change of control, redemption option, period following change of control 120 days       120 days 120 days    
Share cap (in shares) 3.701       3.701 3.701